<template>
	<view>
		<!-- 使用自定义的搜索文件 -->
		<my-search  @click="gotoSearch"></my-search>
		
		<view class="scroll-view-container">
			<!-- 左侧的滑动区域 -->
			<scroll-view class="left-scroll-view" scroll-y="true" :style="{height:wh +'px'}">
				
				<block v-for="(item,i) in cateList" :key="i">
					<view :class="['left-scroll-view-item',i ===active ? 'active':'']" @click="activeChanged(i)">{{item.cat_name}}</view>
				</block>
			</scroll-view>
			<!-- 右侧的滑动区域 -->
			<scroll-view class="right-scroll-view" scroll-y="true" :style="{height:wh +'px'}" :scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
					<view class="cate-lv2-title">/{{item2.cat_name}}/</view>
				
					<view class="cate-lv3-list">
						<view class="cate-lv3-item" v-for="(item3,i3) in data_copyfrom" :key="i3" @click="gotoGoodsList(item3)">
							<text >{{item3}}</text>
						</view>
					</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				//当前设备可用的高度
				wh:0,
				cateList:[],
				active:0,
				cateLevel2:[],
				scrollTop:0,
				data_copyfrom:[]
			};
		},
		onLoad(){
			const sysInfo=uni.getSystemInfoSync()
			this.wh=sysInfo.windowHeight - 50
			
			this.getCateList()
		},
		methods:{
			async getCateList(){
				const {data:res}= await uni.$http.post('http://127.0.0.1:5000/health')
			
				if(res.meta.status !== 200)return uni.$showMsg()
				this.cateList=res.message
				
				this.cateLevel2=res.message[0].children
				
				//获得三级的数据
				for(let i of this.cateLevel2[0].children[0]){							
					this.data_copyfrom=this.data_copyfrom.concat(i.data_copyfrom) 					
				}
				//去掉重复元素
				this.data_copyfrom=Array.from(new Set(this.data_copyfrom))
				
				},
			activeChanged(i){
				this.active=i
				
				this.cateLevel2= this.cateList[i].children
				
				this.data_copyfrom=[]
				for(let i of this.cateLevel2[0].children[0]){
					this.data_copyfrom=this.data_copyfrom.concat(i.data_copyfrom) 					
				}
				this.data_copyfrom=Array.from(new Set(this.data_copyfrom))
				
				
				this.scrollTop=this.scrollTop === 0 ? 1: 0
				},
				
				gotoGoodsList(item3){
					uni.navigateTo({
						url:'/subpkg/goods_list/goods_list?data_copyfrom='+item3+'&cat_name='+this.cateList[this.active].cat_name
					})
				},
				gotoSearch(){
					uni.navigateTo({
						url:'/subpkg/search/search'
					})
				}
			
		}
	}
</script>

<style lang="scss">

.scroll-view-container{
	display: flex;
	
	.left-scroll-view{
		width: 120px;
		
		.left-scroll-view-item{
			background-color: #F7F7F7;
			line-height: 60px;
			text-align: center;
			font-size: 12px;
			
			&.active{
				background-color: #FFFFFF;
				position: relative;
				
				&::before{
					content: ' ';
					display: block;
					width: 3px;
					height: 30px;
					background-color: #C00000;
					position: absolute;
					top:50%;
					left: 0;
					transform: translateY(-50%);
				}
			}
		}
	}
}
.cate-lv2-title{
	font-size: 12px;
	font-weight: bold;
	text-align: center;
	padding: 15px 0;
}
.cate-lv3-list{
	display: flex;
	flex-wrap: wrap;
	.cate-lv3-item{
		width: 33.33%;
		display: flex;
		flex-direction: column;
		justify-content: center;
		align-items: center;
		margin-bottom: 10px;
		
		image{
			width: 60px;
			height: 60px;
		}
		text{
			font-size: 12px;
		}
	}
}
</style>
